1 //===-- RuntimeDyldELF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implementation of ELF support for the MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #include "RuntimeDyldELF.h"
15 #include "RuntimeDyldCheckerImpl.h"
16 #include "llvm/ADT/IntervalMap.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/ADT/Triple.h"
20 #include "llvm/MC/MCStreamer.h"
21 #include "llvm/Object/ELFObjectFile.h"
22 #include "llvm/Object/ObjectFile.h"
23 #include "llvm/Support/ELF.h"
24 #include "llvm/Support/Endian.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/Support/TargetRegistry.h"
29 using namespace llvm::object;
31 #define DEBUG_TYPE "dyld"
33 static inline std::error_code check(std::error_code Err) {
35 report_fatal_error(Err.message());
42 template <class ELFT> class DyldELFObject : public ELFObjectFile<ELFT> {
43 LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
45 typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
46 typedef Elf_Sym_Impl<ELFT> Elf_Sym;
47 typedef Elf_Rel_Impl<ELFT, false> Elf_Rel;
48 typedef Elf_Rel_Impl<ELFT, true> Elf_Rela;
50 typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
52 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
55 DyldELFObject(MemoryBufferRef Wrapper, std::error_code &ec);
57 void updateSectionAddress(const SectionRef &Sec, uint64_t Addr);
59 void updateSymbolAddress(const SymbolRef &SymRef, uint64_t Addr);
61 // Methods for type inquiry through isa, cast and dyn_cast
62 static inline bool classof(const Binary *v) {
63 return (isa<ELFObjectFile<ELFT>>(v) &&
64 classof(cast<ELFObjectFile<ELFT>>(v)));
66 static inline bool classof(const ELFObjectFile<ELFT> *v) {
67 return v->isDyldType();
73 // The MemoryBuffer passed into this constructor is just a wrapper around the
74 // actual memory. Ultimately, the Binary parent class will take ownership of
75 // this MemoryBuffer object but not the underlying memory.
77 DyldELFObject<ELFT>::DyldELFObject(MemoryBufferRef Wrapper, std::error_code &EC)
78 : ELFObjectFile<ELFT>(Wrapper, EC) {
79 this->isDyldELFObject = true;
83 void DyldELFObject<ELFT>::updateSectionAddress(const SectionRef &Sec,
85 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
87 const_cast<Elf_Shdr *>(reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
89 // This assumes the address passed in matches the target address bitness
90 // The template-based type cast handles everything else.
91 shdr->sh_addr = static_cast<addr_type>(Addr);
95 void DyldELFObject<ELFT>::updateSymbolAddress(const SymbolRef &SymRef,
98 Elf_Sym *sym = const_cast<Elf_Sym *>(
99 ELFObjectFile<ELFT>::getSymbol(SymRef.getRawDataRefImpl()));
101 // This assumes the address passed in matches the target address bitness
102 // The template-based type cast handles everything else.
103 sym->st_value = static_cast<addr_type>(Addr);
106 class LoadedELFObjectInfo final
107 : public RuntimeDyld::LoadedObjectInfoHelper<LoadedELFObjectInfo> {
109 LoadedELFObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)
110 : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {}
112 OwningBinary<ObjectFile>
113 getObjectForDebug(const ObjectFile &Obj) const override;
116 template <typename ELFT>
117 std::unique_ptr<DyldELFObject<ELFT>>
118 createRTDyldELFObject(MemoryBufferRef Buffer,
119 const ObjectFile &SourceObject,
120 const LoadedELFObjectInfo &L,
121 std::error_code &ec) {
122 typedef typename ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
123 typedef typename ELFDataTypeTypedefHelper<ELFT>::value_type addr_type;
125 std::unique_ptr<DyldELFObject<ELFT>> Obj =
126 llvm::make_unique<DyldELFObject<ELFT>>(Buffer, ec);
128 // Iterate over all sections in the object.
129 auto SI = SourceObject.section_begin();
130 for (const auto &Sec : Obj->sections()) {
131 StringRef SectionName;
132 Sec.getName(SectionName);
133 if (SectionName != "") {
134 DataRefImpl ShdrRef = Sec.getRawDataRefImpl();
135 Elf_Shdr *shdr = const_cast<Elf_Shdr *>(
136 reinterpret_cast<const Elf_Shdr *>(ShdrRef.p));
138 if (uint64_t SecLoadAddr = L.getSectionLoadAddress(*SI)) {
139 // This assumes that the address passed in matches the target address
140 // bitness. The template-based type cast handles everything else.
141 shdr->sh_addr = static_cast<addr_type>(SecLoadAddr);
150 OwningBinary<ObjectFile> createELFDebugObject(const ObjectFile &Obj,
151 const LoadedELFObjectInfo &L) {
152 assert(Obj.isELF() && "Not an ELF object file.");
154 std::unique_ptr<MemoryBuffer> Buffer =
155 MemoryBuffer::getMemBufferCopy(Obj.getData(), Obj.getFileName());
159 std::unique_ptr<ObjectFile> DebugObj;
160 if (Obj.getBytesInAddress() == 4 && Obj.isLittleEndian()) {
161 typedef ELFType<support::little, false> ELF32LE;
162 DebugObj = createRTDyldELFObject<ELF32LE>(Buffer->getMemBufferRef(), Obj, L,
164 } else if (Obj.getBytesInAddress() == 4 && !Obj.isLittleEndian()) {
165 typedef ELFType<support::big, false> ELF32BE;
166 DebugObj = createRTDyldELFObject<ELF32BE>(Buffer->getMemBufferRef(), Obj, L,
168 } else if (Obj.getBytesInAddress() == 8 && !Obj.isLittleEndian()) {
169 typedef ELFType<support::big, true> ELF64BE;
170 DebugObj = createRTDyldELFObject<ELF64BE>(Buffer->getMemBufferRef(), Obj, L,
172 } else if (Obj.getBytesInAddress() == 8 && Obj.isLittleEndian()) {
173 typedef ELFType<support::little, true> ELF64LE;
174 DebugObj = createRTDyldELFObject<ELF64LE>(Buffer->getMemBufferRef(), Obj, L,
177 llvm_unreachable("Unexpected ELF format");
179 assert(!ec && "Could not construct copy ELF object file");
181 return OwningBinary<ObjectFile>(std::move(DebugObj), std::move(Buffer));
184 OwningBinary<ObjectFile>
185 LoadedELFObjectInfo::getObjectForDebug(const ObjectFile &Obj) const {
186 return createELFDebugObject(Obj, *this);
189 } // anonymous namespace
193 RuntimeDyldELF::RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
194 RuntimeDyld::SymbolResolver &Resolver)
195 : RuntimeDyldImpl(MemMgr, Resolver), GOTSectionID(0), CurrentGOTIndex(0) {}
196 RuntimeDyldELF::~RuntimeDyldELF() {}
198 void RuntimeDyldELF::registerEHFrames() {
199 for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
200 SID EHFrameSID = UnregisteredEHFrameSections[i];
201 uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
202 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
203 size_t EHFrameSize = Sections[EHFrameSID].Size;
204 MemMgr.registerEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
205 RegisteredEHFrameSections.push_back(EHFrameSID);
207 UnregisteredEHFrameSections.clear();
210 void RuntimeDyldELF::deregisterEHFrames() {
211 for (int i = 0, e = RegisteredEHFrameSections.size(); i != e; ++i) {
212 SID EHFrameSID = RegisteredEHFrameSections[i];
213 uint8_t *EHFrameAddr = Sections[EHFrameSID].Address;
214 uint64_t EHFrameLoadAddr = Sections[EHFrameSID].LoadAddress;
215 size_t EHFrameSize = Sections[EHFrameSID].Size;
216 MemMgr.deregisterEHFrames(EHFrameAddr, EHFrameLoadAddr, EHFrameSize);
218 RegisteredEHFrameSections.clear();
221 std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
222 RuntimeDyldELF::loadObject(const object::ObjectFile &O) {
223 return llvm::make_unique<LoadedELFObjectInfo>(*this, loadObjectImpl(O));
226 void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
227 uint64_t Offset, uint64_t Value,
228 uint32_t Type, int64_t Addend,
229 uint64_t SymOffset) {
232 llvm_unreachable("Relocation type not implemented yet!");
234 case ELF::R_X86_64_64: {
235 support::ulittle64_t::ref(Section.Address + Offset) = Value + Addend;
236 DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend)) << " at "
237 << format("%p\n", Section.Address + Offset));
240 case ELF::R_X86_64_32:
241 case ELF::R_X86_64_32S: {
243 assert((Type == ELF::R_X86_64_32 && (Value <= UINT32_MAX)) ||
244 (Type == ELF::R_X86_64_32S &&
245 ((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
246 uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
247 support::ulittle32_t::ref(Section.Address + Offset) = TruncatedAddr;
248 DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr) << " at "
249 << format("%p\n", Section.Address + Offset));
252 case ELF::R_X86_64_PC8: {
253 uint64_t FinalAddress = Section.LoadAddress + Offset;
254 int64_t RealOffset = Value + Addend - FinalAddress;
255 assert(isInt<8>(RealOffset));
256 int8_t TruncOffset = (RealOffset & 0xFF);
257 Section.Address[Offset] = TruncOffset;
260 case ELF::R_X86_64_PC32: {
261 uint64_t FinalAddress = Section.LoadAddress + Offset;
262 int64_t RealOffset = Value + Addend - FinalAddress;
263 assert(isInt<32>(RealOffset));
264 int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
265 support::ulittle32_t::ref(Section.Address + Offset) = TruncOffset;
268 case ELF::R_X86_64_PC64: {
269 uint64_t FinalAddress = Section.LoadAddress + Offset;
270 int64_t RealOffset = Value + Addend - FinalAddress;
271 support::ulittle64_t::ref(Section.Address + Offset) = RealOffset;
277 void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
278 uint64_t Offset, uint32_t Value,
279 uint32_t Type, int32_t Addend) {
281 case ELF::R_386_32: {
282 support::ulittle32_t::ref(Section.Address + Offset) = Value + Addend;
285 case ELF::R_386_PC32: {
286 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
287 uint32_t RealOffset = Value + Addend - FinalAddress;
288 support::ulittle32_t::ref(Section.Address + Offset) = RealOffset;
292 // There are other relocation types, but it appears these are the
293 // only ones currently used by the LLVM ELF object writer
294 llvm_unreachable("Relocation type not implemented yet!");
299 void RuntimeDyldELF::resolveAArch64Relocation(const SectionEntry &Section,
300 uint64_t Offset, uint64_t Value,
301 uint32_t Type, int64_t Addend) {
302 uint32_t *TargetPtr = reinterpret_cast<uint32_t *>(Section.Address + Offset);
303 uint64_t FinalAddress = Section.LoadAddress + Offset;
305 DEBUG(dbgs() << "resolveAArch64Relocation, LocalAddress: 0x"
306 << format("%llx", Section.Address + Offset)
307 << " FinalAddress: 0x" << format("%llx", FinalAddress)
308 << " Value: 0x" << format("%llx", Value) << " Type: 0x"
309 << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
314 llvm_unreachable("Relocation type not implemented yet!");
316 case ELF::R_AARCH64_ABS64: {
317 uint64_t *TargetPtr =
318 reinterpret_cast<uint64_t *>(Section.Address + Offset);
319 *TargetPtr = Value + Addend;
322 case ELF::R_AARCH64_PREL32: {
323 uint64_t Result = Value + Addend - FinalAddress;
324 assert(static_cast<int64_t>(Result) >= INT32_MIN &&
325 static_cast<int64_t>(Result) <= UINT32_MAX);
326 *TargetPtr = static_cast<uint32_t>(Result & 0xffffffffU);
329 case ELF::R_AARCH64_CALL26: // fallthrough
330 case ELF::R_AARCH64_JUMP26: {
331 // Operation: S+A-P. Set Call or B immediate value to bits fff_fffc of the
333 uint64_t BranchImm = Value + Addend - FinalAddress;
335 // "Check that -2^27 <= result < 2^27".
336 assert(isInt<28>(BranchImm));
338 // AArch64 code is emitted with .rela relocations. The data already in any
339 // bits affected by the relocation on entry is garbage.
340 *TargetPtr &= 0xfc000000U;
341 // Immediate goes in bits 25:0 of B and BL.
342 *TargetPtr |= static_cast<uint32_t>(BranchImm & 0xffffffcU) >> 2;
345 case ELF::R_AARCH64_MOVW_UABS_G3: {
346 uint64_t Result = Value + Addend;
348 // AArch64 code is emitted with .rela relocations. The data already in any
349 // bits affected by the relocation on entry is garbage.
350 *TargetPtr &= 0xffe0001fU;
351 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
352 *TargetPtr |= Result >> (48 - 5);
353 // Shift must be "lsl #48", in bits 22:21
354 assert((*TargetPtr >> 21 & 0x3) == 3 && "invalid shift for relocation");
357 case ELF::R_AARCH64_MOVW_UABS_G2_NC: {
358 uint64_t Result = Value + Addend;
360 // AArch64 code is emitted with .rela relocations. The data already in any
361 // bits affected by the relocation on entry is garbage.
362 *TargetPtr &= 0xffe0001fU;
363 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
364 *TargetPtr |= ((Result & 0xffff00000000ULL) >> (32 - 5));
365 // Shift must be "lsl #32", in bits 22:21
366 assert((*TargetPtr >> 21 & 0x3) == 2 && "invalid shift for relocation");
369 case ELF::R_AARCH64_MOVW_UABS_G1_NC: {
370 uint64_t Result = Value + Addend;
372 // AArch64 code is emitted with .rela relocations. The data already in any
373 // bits affected by the relocation on entry is garbage.
374 *TargetPtr &= 0xffe0001fU;
375 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
376 *TargetPtr |= ((Result & 0xffff0000U) >> (16 - 5));
377 // Shift must be "lsl #16", in bits 22:2
378 assert((*TargetPtr >> 21 & 0x3) == 1 && "invalid shift for relocation");
381 case ELF::R_AARCH64_MOVW_UABS_G0_NC: {
382 uint64_t Result = Value + Addend;
384 // AArch64 code is emitted with .rela relocations. The data already in any
385 // bits affected by the relocation on entry is garbage.
386 *TargetPtr &= 0xffe0001fU;
387 // Immediate goes in bits 20:5 of MOVZ/MOVK instruction
388 *TargetPtr |= ((Result & 0xffffU) << 5);
389 // Shift must be "lsl #0", in bits 22:21.
390 assert((*TargetPtr >> 21 & 0x3) == 0 && "invalid shift for relocation");
393 case ELF::R_AARCH64_ADR_PREL_PG_HI21: {
394 // Operation: Page(S+A) - Page(P)
396 ((Value + Addend) & ~0xfffULL) - (FinalAddress & ~0xfffULL);
398 // Check that -2^32 <= X < 2^32
399 assert(isInt<33>(Result) && "overflow check failed for relocation");
401 // AArch64 code is emitted with .rela relocations. The data already in any
402 // bits affected by the relocation on entry is garbage.
403 *TargetPtr &= 0x9f00001fU;
404 // Immediate goes in bits 30:29 + 5:23 of ADRP instruction, taken
405 // from bits 32:12 of X.
406 *TargetPtr |= ((Result & 0x3000U) << (29 - 12));
407 *TargetPtr |= ((Result & 0x1ffffc000ULL) >> (14 - 5));
410 case ELF::R_AARCH64_LDST32_ABS_LO12_NC: {
412 uint64_t Result = Value + Addend;
414 // AArch64 code is emitted with .rela relocations. The data already in any
415 // bits affected by the relocation on entry is garbage.
416 *TargetPtr &= 0xffc003ffU;
417 // Immediate goes in bits 21:10 of LD/ST instruction, taken
418 // from bits 11:2 of X
419 *TargetPtr |= ((Result & 0xffc) << (10 - 2));
422 case ELF::R_AARCH64_LDST64_ABS_LO12_NC: {
424 uint64_t Result = Value + Addend;
426 // AArch64 code is emitted with .rela relocations. The data already in any
427 // bits affected by the relocation on entry is garbage.
428 *TargetPtr &= 0xffc003ffU;
429 // Immediate goes in bits 21:10 of LD/ST instruction, taken
430 // from bits 11:3 of X
431 *TargetPtr |= ((Result & 0xff8) << (10 - 3));
437 void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
438 uint64_t Offset, uint32_t Value,
439 uint32_t Type, int32_t Addend) {
440 // TODO: Add Thumb relocations.
441 uint32_t *TargetPtr = (uint32_t *)(Section.Address + Offset);
442 uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
445 DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
446 << Section.Address + Offset
447 << " FinalAddress: " << format("%p", FinalAddress) << " Value: "
448 << format("%x", Value) << " Type: " << format("%x", Type)
449 << " Addend: " << format("%x", Addend) << "\n");
453 llvm_unreachable("Not implemented relocation type!");
455 case ELF::R_ARM_NONE:
457 case ELF::R_ARM_PREL31:
458 case ELF::R_ARM_TARGET1:
459 case ELF::R_ARM_ABS32:
462 // Write first 16 bit of 32 bit value to the mov instruction.
463 // Last 4 bit should be shifted.
464 case ELF::R_ARM_MOVW_ABS_NC:
465 case ELF::R_ARM_MOVT_ABS:
466 if (Type == ELF::R_ARM_MOVW_ABS_NC)
467 Value = Value & 0xFFFF;
468 else if (Type == ELF::R_ARM_MOVT_ABS)
469 Value = (Value >> 16) & 0xFFFF;
470 *TargetPtr &= ~0x000F0FFF;
471 *TargetPtr |= Value & 0xFFF;
472 *TargetPtr |= ((Value >> 12) & 0xF) << 16;
474 // Write 24 bit relative value to the branch instruction.
475 case ELF::R_ARM_PC24: // Fall through.
476 case ELF::R_ARM_CALL: // Fall through.
477 case ELF::R_ARM_JUMP24:
478 int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
479 RelValue = (RelValue & 0x03FFFFFC) >> 2;
480 assert((*TargetPtr & 0xFFFFFF) == 0xFFFFFE);
481 *TargetPtr &= 0xFF000000;
482 *TargetPtr |= RelValue;
487 void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
488 uint64_t Offset, uint32_t Value,
489 uint32_t Type, int32_t Addend) {
490 uint8_t *TargetPtr = Section.Address + Offset;
493 DEBUG(dbgs() << "resolveMIPSRelocation, LocalAddress: "
494 << Section.Address + Offset << " FinalAddress: "
495 << format("%p", Section.LoadAddress + Offset) << " Value: "
496 << format("%x", Value) << " Type: " << format("%x", Type)
497 << " Addend: " << format("%x", Addend) << "\n");
499 uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
503 llvm_unreachable("Not implemented relocation type!");
506 writeBytesUnaligned(Value, TargetPtr, 4);
510 Insn |= (Value & 0x0fffffff) >> 2;
511 writeBytesUnaligned(Insn, TargetPtr, 4);
513 case ELF::R_MIPS_HI16:
514 // Get the higher 16-bits. Also add 1 if bit 15 is 1.
516 Insn |= ((Value + 0x8000) >> 16) & 0xffff;
517 writeBytesUnaligned(Insn, TargetPtr, 4);
519 case ELF::R_MIPS_LO16:
521 Insn |= Value & 0xffff;
522 writeBytesUnaligned(Insn, TargetPtr, 4);
524 case ELF::R_MIPS_PC32: {
525 uint32_t FinalAddress = (Section.LoadAddress + Offset);
526 writeBytesUnaligned(Value - FinalAddress, (uint8_t *)TargetPtr, 4);
529 case ELF::R_MIPS_PC16: {
530 uint32_t FinalAddress = (Section.LoadAddress + Offset);
532 Insn |= ((Value - FinalAddress) >> 2) & 0xffff;
533 writeBytesUnaligned(Insn, TargetPtr, 4);
536 case ELF::R_MIPS_PC19_S2: {
537 uint32_t FinalAddress = (Section.LoadAddress + Offset);
539 Insn |= ((Value - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
540 writeBytesUnaligned(Insn, TargetPtr, 4);
543 case ELF::R_MIPS_PC21_S2: {
544 uint32_t FinalAddress = (Section.LoadAddress + Offset);
546 Insn |= ((Value - FinalAddress) >> 2) & 0x1fffff;
547 writeBytesUnaligned(Insn, TargetPtr, 4);
550 case ELF::R_MIPS_PC26_S2: {
551 uint32_t FinalAddress = (Section.LoadAddress + Offset);
553 Insn |= ((Value - FinalAddress) >> 2) & 0x3ffffff;
554 writeBytesUnaligned(Insn, TargetPtr, 4);
557 case ELF::R_MIPS_PCHI16: {
558 uint32_t FinalAddress = (Section.LoadAddress + Offset);
560 Insn |= ((Value - FinalAddress + 0x8000) >> 16) & 0xffff;
561 writeBytesUnaligned(Insn, TargetPtr, 4);
564 case ELF::R_MIPS_PCLO16: {
565 uint32_t FinalAddress = (Section.LoadAddress + Offset);
567 Insn |= (Value - FinalAddress) & 0xffff;
568 writeBytesUnaligned(Insn, TargetPtr, 4);
574 void RuntimeDyldELF::setMipsABI(const ObjectFile &Obj) {
575 if (Arch == Triple::UnknownArch ||
576 !StringRef(Triple::getArchTypePrefix(Arch)).equals("mips")) {
577 IsMipsO32ABI = false;
578 IsMipsN64ABI = false;
582 Obj.getPlatformFlags(AbiVariant);
583 IsMipsO32ABI = AbiVariant & ELF::EF_MIPS_ABI_O32;
584 IsMipsN64ABI = Obj.getFileFormatName().equals("ELF64-mips");
585 if (AbiVariant & ELF::EF_MIPS_ABI2)
586 llvm_unreachable("Mips N32 ABI is not supported yet");
589 void RuntimeDyldELF::resolveMIPS64Relocation(const SectionEntry &Section,
590 uint64_t Offset, uint64_t Value,
591 uint32_t Type, int64_t Addend,
594 uint32_t r_type = Type & 0xff;
595 uint32_t r_type2 = (Type >> 8) & 0xff;
596 uint32_t r_type3 = (Type >> 16) & 0xff;
598 // RelType is used to keep information for which relocation type we are
599 // applying relocation.
600 uint32_t RelType = r_type;
601 int64_t CalculatedValue = evaluateMIPS64Relocation(Section, Offset, Value,
603 SymOffset, SectionID);
604 if (r_type2 != ELF::R_MIPS_NONE) {
606 CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
607 CalculatedValue, SymOffset,
610 if (r_type3 != ELF::R_MIPS_NONE) {
612 CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
613 CalculatedValue, SymOffset,
616 applyMIPS64Relocation(Section.Address + Offset, CalculatedValue, RelType);
620 RuntimeDyldELF::evaluateMIPS64Relocation(const SectionEntry &Section,
621 uint64_t Offset, uint64_t Value,
622 uint32_t Type, int64_t Addend,
623 uint64_t SymOffset, SID SectionID) {
625 DEBUG(dbgs() << "evaluateMIPS64Relocation, LocalAddress: 0x"
626 << format("%llx", Section.Address + Offset)
627 << " FinalAddress: 0x"
628 << format("%llx", Section.LoadAddress + Offset)
629 << " Value: 0x" << format("%llx", Value) << " Type: 0x"
630 << format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
631 << " SymOffset: " << format("%x", SymOffset)
636 llvm_unreachable("Not implemented relocation type!");
638 case ELF::R_MIPS_JALR:
639 case ELF::R_MIPS_NONE:
643 return Value + Addend;
645 return ((Value + Addend) >> 2) & 0x3ffffff;
646 case ELF::R_MIPS_GPREL16: {
647 uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
648 return Value + Addend - (GOTAddr + 0x7ff0);
650 case ELF::R_MIPS_SUB:
651 return Value - Addend;
652 case ELF::R_MIPS_HI16:
653 // Get the higher 16-bits. Also add 1 if bit 15 is 1.
654 return ((Value + Addend + 0x8000) >> 16) & 0xffff;
655 case ELF::R_MIPS_LO16:
656 return (Value + Addend) & 0xffff;
657 case ELF::R_MIPS_CALL16:
658 case ELF::R_MIPS_GOT_DISP:
659 case ELF::R_MIPS_GOT_PAGE: {
660 uint8_t *LocalGOTAddr =
661 getSectionAddress(SectionToGOTMap[SectionID]) + SymOffset;
662 uint64_t GOTEntry = readBytesUnaligned(LocalGOTAddr, 8);
665 if (Type == ELF::R_MIPS_GOT_PAGE)
666 Value = (Value + 0x8000) & ~0xffff;
669 assert(GOTEntry == Value &&
670 "GOT entry has two different addresses.");
672 writeBytesUnaligned(Value, LocalGOTAddr, 8);
674 return (SymOffset - 0x7ff0) & 0xffff;
676 case ELF::R_MIPS_GOT_OFST: {
677 int64_t page = (Value + Addend + 0x8000) & ~0xffff;
678 return (Value + Addend - page) & 0xffff;
680 case ELF::R_MIPS_GPREL32: {
681 uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
682 return Value + Addend - (GOTAddr + 0x7ff0);
684 case ELF::R_MIPS_PC16: {
685 uint64_t FinalAddress = (Section.LoadAddress + Offset);
686 return ((Value + Addend - FinalAddress) >> 2) & 0xffff;
688 case ELF::R_MIPS_PC32: {
689 uint64_t FinalAddress = (Section.LoadAddress + Offset);
690 return Value + Addend - FinalAddress;
692 case ELF::R_MIPS_PC18_S3: {
693 uint64_t FinalAddress = (Section.LoadAddress + Offset);
694 return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff;
696 case ELF::R_MIPS_PC19_S2: {
697 uint64_t FinalAddress = (Section.LoadAddress + Offset);
698 return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
700 case ELF::R_MIPS_PC21_S2: {
701 uint64_t FinalAddress = (Section.LoadAddress + Offset);
702 return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff;
704 case ELF::R_MIPS_PC26_S2: {
705 uint64_t FinalAddress = (Section.LoadAddress + Offset);
706 return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff;
708 case ELF::R_MIPS_PCHI16: {
709 uint64_t FinalAddress = (Section.LoadAddress + Offset);
710 return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff;
712 case ELF::R_MIPS_PCLO16: {
713 uint64_t FinalAddress = (Section.LoadAddress + Offset);
714 return (Value + Addend - FinalAddress) & 0xffff;
720 void RuntimeDyldELF::applyMIPS64Relocation(uint8_t *TargetPtr,
721 int64_t CalculatedValue,
723 uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
729 case ELF::R_MIPS_GPREL32:
730 case ELF::R_MIPS_PC32:
731 writeBytesUnaligned(CalculatedValue & 0xffffffff, TargetPtr, 4);
734 case ELF::R_MIPS_SUB:
735 writeBytesUnaligned(CalculatedValue, TargetPtr, 8);
738 case ELF::R_MIPS_PC26_S2:
739 Insn = (Insn & 0xfc000000) | CalculatedValue;
740 writeBytesUnaligned(Insn, TargetPtr, 4);
742 case ELF::R_MIPS_GPREL16:
743 Insn = (Insn & 0xffff0000) | (CalculatedValue & 0xffff);
744 writeBytesUnaligned(Insn, TargetPtr, 4);
746 case ELF::R_MIPS_HI16:
747 case ELF::R_MIPS_LO16:
748 case ELF::R_MIPS_PCHI16:
749 case ELF::R_MIPS_PCLO16:
750 case ELF::R_MIPS_PC16:
751 case ELF::R_MIPS_CALL16:
752 case ELF::R_MIPS_GOT_DISP:
753 case ELF::R_MIPS_GOT_PAGE:
754 case ELF::R_MIPS_GOT_OFST:
755 Insn = (Insn & 0xffff0000) | CalculatedValue;
756 writeBytesUnaligned(Insn, TargetPtr, 4);
758 case ELF::R_MIPS_PC18_S3:
759 Insn = (Insn & 0xfffc0000) | CalculatedValue;
760 writeBytesUnaligned(Insn, TargetPtr, 4);
762 case ELF::R_MIPS_PC19_S2:
763 Insn = (Insn & 0xfff80000) | CalculatedValue;
764 writeBytesUnaligned(Insn, TargetPtr, 4);
766 case ELF::R_MIPS_PC21_S2:
767 Insn = (Insn & 0xffe00000) | CalculatedValue;
768 writeBytesUnaligned(Insn, TargetPtr, 4);
773 // Return the .TOC. section and offset.
774 void RuntimeDyldELF::findPPC64TOCSection(const ELFObjectFileBase &Obj,
775 ObjSectionToIDMap &LocalSections,
776 RelocationValueRef &Rel) {
777 // Set a default SectionID in case we do not find a TOC section below.
778 // This may happen for references to TOC base base (sym@toc, .odp
779 // relocation) without a .toc directive. In this case just use the
780 // first section (which is usually the .odp) since the code won't
781 // reference the .toc base directly.
782 Rel.SymbolName = nullptr;
785 // The TOC consists of sections .got, .toc, .tocbss, .plt in that
786 // order. The TOC starts where the first of these sections starts.
787 for (auto &Section: Obj.sections()) {
788 StringRef SectionName;
789 check(Section.getName(SectionName));
791 if (SectionName == ".got"
792 || SectionName == ".toc"
793 || SectionName == ".tocbss"
794 || SectionName == ".plt") {
795 Rel.SectionID = findOrEmitSection(Obj, Section, false, LocalSections);
800 // Per the ppc64-elf-linux ABI, The TOC base is TOC value plus 0x8000
801 // thus permitting a full 64 Kbytes segment.
805 // Returns the sections and offset associated with the ODP entry referenced
807 void RuntimeDyldELF::findOPDEntrySection(const ELFObjectFileBase &Obj,
808 ObjSectionToIDMap &LocalSections,
809 RelocationValueRef &Rel) {
810 // Get the ELF symbol value (st_value) to compare with Relocation offset in
812 for (section_iterator si = Obj.section_begin(), se = Obj.section_end();
814 section_iterator RelSecI = si->getRelocatedSection();
815 if (RelSecI == Obj.section_end())
818 StringRef RelSectionName;
819 check(RelSecI->getName(RelSectionName));
820 if (RelSectionName != ".opd")
823 for (elf_relocation_iterator i = si->relocation_begin(),
824 e = si->relocation_end();
826 // The R_PPC64_ADDR64 relocation indicates the first field
828 uint64_t TypeFunc = i->getType();
829 if (TypeFunc != ELF::R_PPC64_ADDR64) {
834 uint64_t TargetSymbolOffset = i->getOffset();
835 symbol_iterator TargetSymbol = i->getSymbol();
836 ErrorOr<int64_t> AddendOrErr = i->getAddend();
837 Check(AddendOrErr.getError());
838 int64_t Addend = *AddendOrErr;
844 // Just check if following relocation is a R_PPC64_TOC
845 uint64_t TypeTOC = i->getType();
846 if (TypeTOC != ELF::R_PPC64_TOC)
849 // Finally compares the Symbol value and the target symbol offset
850 // to check if this .opd entry refers to the symbol the relocation
852 if (Rel.Addend != (int64_t)TargetSymbolOffset)
855 ErrorOr<section_iterator> TSIOrErr = TargetSymbol->getSection();
856 check(TSIOrErr.getError());
857 section_iterator tsi = *TSIOrErr;
858 bool IsCode = tsi->isText();
859 Rel.SectionID = findOrEmitSection(Obj, (*tsi), IsCode, LocalSections);
860 Rel.Addend = (intptr_t)Addend;
864 llvm_unreachable("Attempting to get address of ODP entry!");
867 // Relocation masks following the #lo(value), #hi(value), #ha(value),
868 // #higher(value), #highera(value), #highest(value), and #highesta(value)
869 // macros defined in section 4.5.1. Relocation Types of the PPC-elf64abi
872 static inline uint16_t applyPPClo(uint64_t value) { return value & 0xffff; }
874 static inline uint16_t applyPPChi(uint64_t value) {
875 return (value >> 16) & 0xffff;
878 static inline uint16_t applyPPCha (uint64_t value) {
879 return ((value + 0x8000) >> 16) & 0xffff;
882 static inline uint16_t applyPPChigher(uint64_t value) {
883 return (value >> 32) & 0xffff;
886 static inline uint16_t applyPPChighera (uint64_t value) {
887 return ((value + 0x8000) >> 32) & 0xffff;
890 static inline uint16_t applyPPChighest(uint64_t value) {
891 return (value >> 48) & 0xffff;
894 static inline uint16_t applyPPChighesta (uint64_t value) {
895 return ((value + 0x8000) >> 48) & 0xffff;
898 void RuntimeDyldELF::resolvePPC32Relocation(const SectionEntry &Section,
899 uint64_t Offset, uint64_t Value,
900 uint32_t Type, int64_t Addend) {
901 uint8_t *LocalAddress = Section.Address + Offset;
904 llvm_unreachable("Relocation type not implemented yet!");
906 case ELF::R_PPC_ADDR16_LO:
907 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
909 case ELF::R_PPC_ADDR16_HI:
910 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
912 case ELF::R_PPC_ADDR16_HA:
913 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
918 void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section,
919 uint64_t Offset, uint64_t Value,
920 uint32_t Type, int64_t Addend) {
921 uint8_t *LocalAddress = Section.Address + Offset;
924 llvm_unreachable("Relocation type not implemented yet!");
926 case ELF::R_PPC64_ADDR16:
927 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
929 case ELF::R_PPC64_ADDR16_DS:
930 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
932 case ELF::R_PPC64_ADDR16_LO:
933 writeInt16BE(LocalAddress, applyPPClo(Value + Addend));
935 case ELF::R_PPC64_ADDR16_LO_DS:
936 writeInt16BE(LocalAddress, applyPPClo(Value + Addend) & ~3);
938 case ELF::R_PPC64_ADDR16_HI:
939 writeInt16BE(LocalAddress, applyPPChi(Value + Addend));
941 case ELF::R_PPC64_ADDR16_HA:
942 writeInt16BE(LocalAddress, applyPPCha(Value + Addend));
944 case ELF::R_PPC64_ADDR16_HIGHER:
945 writeInt16BE(LocalAddress, applyPPChigher(Value + Addend));
947 case ELF::R_PPC64_ADDR16_HIGHERA:
948 writeInt16BE(LocalAddress, applyPPChighera(Value + Addend));
950 case ELF::R_PPC64_ADDR16_HIGHEST:
951 writeInt16BE(LocalAddress, applyPPChighest(Value + Addend));
953 case ELF::R_PPC64_ADDR16_HIGHESTA:
954 writeInt16BE(LocalAddress, applyPPChighesta(Value + Addend));
956 case ELF::R_PPC64_ADDR14: {
957 assert(((Value + Addend) & 3) == 0);
958 // Preserve the AA/LK bits in the branch instruction
959 uint8_t aalk = *(LocalAddress + 3);
960 writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
962 case ELF::R_PPC64_REL16_LO: {
963 uint64_t FinalAddress = (Section.LoadAddress + Offset);
964 uint64_t Delta = Value - FinalAddress + Addend;
965 writeInt16BE(LocalAddress, applyPPClo(Delta));
967 case ELF::R_PPC64_REL16_HI: {
968 uint64_t FinalAddress = (Section.LoadAddress + Offset);
969 uint64_t Delta = Value - FinalAddress + Addend;
970 writeInt16BE(LocalAddress, applyPPChi(Delta));
972 case ELF::R_PPC64_REL16_HA: {
973 uint64_t FinalAddress = (Section.LoadAddress + Offset);
974 uint64_t Delta = Value - FinalAddress + Addend;
975 writeInt16BE(LocalAddress, applyPPCha(Delta));
977 case ELF::R_PPC64_ADDR32: {
978 int32_t Result = static_cast<int32_t>(Value + Addend);
979 if (SignExtend32<32>(Result) != Result)
980 llvm_unreachable("Relocation R_PPC64_ADDR32 overflow");
981 writeInt32BE(LocalAddress, Result);
983 case ELF::R_PPC64_REL24: {
984 uint64_t FinalAddress = (Section.LoadAddress + Offset);
985 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
986 if (SignExtend32<26>(delta) != delta)
987 llvm_unreachable("Relocation R_PPC64_REL24 overflow");
988 // Generates a 'bl <address>' instruction
989 writeInt32BE(LocalAddress, 0x48000001 | (delta & 0x03FFFFFC));
991 case ELF::R_PPC64_REL32: {
992 uint64_t FinalAddress = (Section.LoadAddress + Offset);
993 int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
994 if (SignExtend32<32>(delta) != delta)
995 llvm_unreachable("Relocation R_PPC64_REL32 overflow");
996 writeInt32BE(LocalAddress, delta);
998 case ELF::R_PPC64_REL64: {
999 uint64_t FinalAddress = (Section.LoadAddress + Offset);
1000 uint64_t Delta = Value - FinalAddress + Addend;
1001 writeInt64BE(LocalAddress, Delta);
1003 case ELF::R_PPC64_ADDR64:
1004 writeInt64BE(LocalAddress, Value + Addend);
1009 void RuntimeDyldELF::resolveSystemZRelocation(const SectionEntry &Section,
1010 uint64_t Offset, uint64_t Value,
1011 uint32_t Type, int64_t Addend) {
1012 uint8_t *LocalAddress = Section.Address + Offset;
1015 llvm_unreachable("Relocation type not implemented yet!");
1017 case ELF::R_390_PC16DBL:
1018 case ELF::R_390_PLT16DBL: {
1019 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1020 assert(int16_t(Delta / 2) * 2 == Delta && "R_390_PC16DBL overflow");
1021 writeInt16BE(LocalAddress, Delta / 2);
1024 case ELF::R_390_PC32DBL:
1025 case ELF::R_390_PLT32DBL: {
1026 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1027 assert(int32_t(Delta / 2) * 2 == Delta && "R_390_PC32DBL overflow");
1028 writeInt32BE(LocalAddress, Delta / 2);
1031 case ELF::R_390_PC32: {
1032 int64_t Delta = (Value + Addend) - (Section.LoadAddress + Offset);
1033 assert(int32_t(Delta) == Delta && "R_390_PC32 overflow");
1034 writeInt32BE(LocalAddress, Delta);
1038 writeInt64BE(LocalAddress, Value + Addend);
1043 // The target location for the relocation is described by RE.SectionID and
1044 // RE.Offset. RE.SectionID can be used to find the SectionEntry. Each
1045 // SectionEntry has three members describing its location.
1046 // SectionEntry::Address is the address at which the section has been loaded
1047 // into memory in the current (host) process. SectionEntry::LoadAddress is the
1048 // address that the section will have in the target process.
1049 // SectionEntry::ObjAddress is the address of the bits for this section in the
1050 // original emitted object image (also in the current address space).
1052 // Relocations will be applied as if the section were loaded at
1053 // SectionEntry::LoadAddress, but they will be applied at an address based
1054 // on SectionEntry::Address. SectionEntry::ObjAddress will be used to refer to
1055 // Target memory contents if they are required for value calculations.
1057 // The Value parameter here is the load address of the symbol for the
1058 // relocation to be applied. For relocations which refer to symbols in the
1059 // current object Value will be the LoadAddress of the section in which
1060 // the symbol resides (RE.Addend provides additional information about the
1061 // symbol location). For external symbols, Value will be the address of the
1062 // symbol in the target address space.
1063 void RuntimeDyldELF::resolveRelocation(const RelocationEntry &RE,
1065 const SectionEntry &Section = Sections[RE.SectionID];
1066 return resolveRelocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
1067 RE.SymOffset, RE.SectionID);
1070 void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
1071 uint64_t Offset, uint64_t Value,
1072 uint32_t Type, int64_t Addend,
1073 uint64_t SymOffset, SID SectionID) {
1075 case Triple::x86_64:
1076 resolveX86_64Relocation(Section, Offset, Value, Type, Addend, SymOffset);
1079 resolveX86Relocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
1080 (uint32_t)(Addend & 0xffffffffL));
1082 case Triple::aarch64:
1083 case Triple::aarch64_be:
1084 resolveAArch64Relocation(Section, Offset, Value, Type, Addend);
1086 case Triple::arm: // Fall through.
1089 case Triple::thumbeb:
1090 resolveARMRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL), Type,
1091 (uint32_t)(Addend & 0xffffffffL));
1093 case Triple::mips: // Fall through.
1094 case Triple::mipsel:
1095 case Triple::mips64:
1096 case Triple::mips64el:
1098 resolveMIPSRelocation(Section, Offset, (uint32_t)(Value & 0xffffffffL),
1099 Type, (uint32_t)(Addend & 0xffffffffL));
1100 else if (IsMipsN64ABI)
1101 resolveMIPS64Relocation(Section, Offset, Value, Type, Addend, SymOffset,
1104 llvm_unreachable("Mips ABI not handled");
1107 resolvePPC32Relocation(Section, Offset, Value, Type, Addend);
1109 case Triple::ppc64: // Fall through.
1110 case Triple::ppc64le:
1111 resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
1113 case Triple::systemz:
1114 resolveSystemZRelocation(Section, Offset, Value, Type, Addend);
1117 llvm_unreachable("Unsupported CPU type!");
1121 void *RuntimeDyldELF::computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const {
1122 return (void*)(Sections[SectionID].ObjAddress + Offset);
1125 void RuntimeDyldELF::processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value) {
1126 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend, Value.Offset);
1127 if (Value.SymbolName)
1128 addRelocationForSymbol(RE, Value.SymbolName);
1130 addRelocationForSection(RE, Value.SectionID);
1133 uint32_t RuntimeDyldELF::getMatchingLoRelocation(uint32_t RelType,
1134 bool IsLocal) const {
1136 case ELF::R_MICROMIPS_GOT16:
1138 return ELF::R_MICROMIPS_LO16;
1140 case ELF::R_MICROMIPS_HI16:
1141 return ELF::R_MICROMIPS_LO16;
1142 case ELF::R_MIPS_GOT16:
1144 return ELF::R_MIPS_LO16;
1146 case ELF::R_MIPS_HI16:
1147 return ELF::R_MIPS_LO16;
1148 case ELF::R_MIPS_PCHI16:
1149 return ELF::R_MIPS_PCLO16;
1153 return ELF::R_MIPS_NONE;
1156 relocation_iterator RuntimeDyldELF::processRelocationRef(
1157 unsigned SectionID, relocation_iterator RelI, const ObjectFile &O,
1158 ObjSectionToIDMap &ObjSectionToID, StubMap &Stubs) {
1159 const auto &Obj = cast<ELFObjectFileBase>(O);
1160 uint64_t RelType = RelI->getType();
1161 ErrorOr<int64_t> AddendOrErr = ELFRelocationRef(*RelI).getAddend();
1162 int64_t Addend = AddendOrErr ? *AddendOrErr : 0;
1163 elf_symbol_iterator Symbol = RelI->getSymbol();
1165 // Obtain the symbol name which is referenced in the relocation
1166 StringRef TargetName;
1167 if (Symbol != Obj.symbol_end()) {
1168 ErrorOr<StringRef> TargetNameOrErr = Symbol->getName();
1169 if (std::error_code EC = TargetNameOrErr.getError())
1170 report_fatal_error(EC.message());
1171 TargetName = *TargetNameOrErr;
1173 DEBUG(dbgs() << "\t\tRelType: " << RelType << " Addend: " << Addend
1174 << " TargetName: " << TargetName << "\n");
1175 RelocationValueRef Value;
1176 // First search for the symbol in the local symbol table
1177 SymbolRef::Type SymType = SymbolRef::ST_Unknown;
1179 // Search for the symbol in the global symbol table
1180 RTDyldSymbolTable::const_iterator gsi = GlobalSymbolTable.end();
1181 if (Symbol != Obj.symbol_end()) {
1182 gsi = GlobalSymbolTable.find(TargetName.data());
1183 SymType = Symbol->getType();
1185 if (gsi != GlobalSymbolTable.end()) {
1186 const auto &SymInfo = gsi->second;
1187 Value.SectionID = SymInfo.getSectionID();
1188 Value.Offset = SymInfo.getOffset();
1189 Value.Addend = SymInfo.getOffset() + Addend;
1192 case SymbolRef::ST_Debug: {
1193 // TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
1194 // and can be changed by another developers. Maybe best way is add
1195 // a new symbol type ST_Section to SymbolRef and use it.
1196 section_iterator si = *Symbol->getSection();
1197 if (si == Obj.section_end())
1198 llvm_unreachable("Symbol section not found, bad object file format!");
1199 DEBUG(dbgs() << "\t\tThis is section symbol\n");
1200 bool isCode = si->isText();
1201 Value.SectionID = findOrEmitSection(Obj, (*si), isCode, ObjSectionToID);
1202 Value.Addend = Addend;
1205 case SymbolRef::ST_Data:
1206 case SymbolRef::ST_Unknown: {
1207 Value.SymbolName = TargetName.data();
1208 Value.Addend = Addend;
1210 // Absolute relocations will have a zero symbol ID (STN_UNDEF), which
1211 // will manifest here as a NULL symbol name.
1212 // We can set this as a valid (but empty) symbol name, and rely
1213 // on addRelocationForSymbol to handle this.
1214 if (!Value.SymbolName)
1215 Value.SymbolName = "";
1219 llvm_unreachable("Unresolved symbol type!");
1224 uint64_t Offset = RelI->getOffset();
1226 DEBUG(dbgs() << "\t\tSectionID: " << SectionID << " Offset: " << Offset
1228 if ((Arch == Triple::aarch64 || Arch == Triple::aarch64_be) &&
1229 (RelType == ELF::R_AARCH64_CALL26 || RelType == ELF::R_AARCH64_JUMP26)) {
1230 // This is an AArch64 branch relocation, need to use a stub function.
1231 DEBUG(dbgs() << "\t\tThis is an AArch64 branch relocation.");
1232 SectionEntry &Section = Sections[SectionID];
1234 // Look for an existing stub.
1235 StubMap::const_iterator i = Stubs.find(Value);
1236 if (i != Stubs.end()) {
1237 resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
1239 DEBUG(dbgs() << " Stub function found\n");
1241 // Create a new stub function.
1242 DEBUG(dbgs() << " Create a new stub function\n");
1243 Stubs[Value] = Section.StubOffset;
1244 uint8_t *StubTargetAddr =
1245 createStubFunction(Section.Address + Section.StubOffset);
1247 RelocationEntry REmovz_g3(SectionID, StubTargetAddr - Section.Address,
1248 ELF::R_AARCH64_MOVW_UABS_G3, Value.Addend);
1249 RelocationEntry REmovk_g2(SectionID, StubTargetAddr - Section.Address + 4,
1250 ELF::R_AARCH64_MOVW_UABS_G2_NC, Value.Addend);
1251 RelocationEntry REmovk_g1(SectionID, StubTargetAddr - Section.Address + 8,
1252 ELF::R_AARCH64_MOVW_UABS_G1_NC, Value.Addend);
1253 RelocationEntry REmovk_g0(SectionID,
1254 StubTargetAddr - Section.Address + 12,
1255 ELF::R_AARCH64_MOVW_UABS_G0_NC, Value.Addend);
1257 if (Value.SymbolName) {
1258 addRelocationForSymbol(REmovz_g3, Value.SymbolName);
1259 addRelocationForSymbol(REmovk_g2, Value.SymbolName);
1260 addRelocationForSymbol(REmovk_g1, Value.SymbolName);
1261 addRelocationForSymbol(REmovk_g0, Value.SymbolName);
1263 addRelocationForSection(REmovz_g3, Value.SectionID);
1264 addRelocationForSection(REmovk_g2, Value.SectionID);
1265 addRelocationForSection(REmovk_g1, Value.SectionID);
1266 addRelocationForSection(REmovk_g0, Value.SectionID);
1268 resolveRelocation(Section, Offset,
1269 (uint64_t)Section.Address + Section.StubOffset, RelType,
1271 Section.StubOffset += getMaxStubSize();
1273 } else if (Arch == Triple::arm) {
1274 if (RelType == ELF::R_ARM_PC24 || RelType == ELF::R_ARM_CALL ||
1275 RelType == ELF::R_ARM_JUMP24) {
1276 // This is an ARM branch relocation, need to use a stub function.
1277 DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
1278 SectionEntry &Section = Sections[SectionID];
1280 // Look for an existing stub.
1281 StubMap::const_iterator i = Stubs.find(Value);
1282 if (i != Stubs.end()) {
1283 resolveRelocation(Section, Offset, (uint64_t)Section.Address + i->second,
1285 DEBUG(dbgs() << " Stub function found\n");
1287 // Create a new stub function.
1288 DEBUG(dbgs() << " Create a new stub function\n");
1289 Stubs[Value] = Section.StubOffset;
1290 uint8_t *StubTargetAddr =
1291 createStubFunction(Section.Address + Section.StubOffset);
1292 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
1293 ELF::R_ARM_ABS32, Value.Addend);
1294 if (Value.SymbolName)
1295 addRelocationForSymbol(RE, Value.SymbolName);
1297 addRelocationForSection(RE, Value.SectionID);
1299 resolveRelocation(Section, Offset,
1300 (uint64_t)Section.Address + Section.StubOffset, RelType,
1302 Section.StubOffset += getMaxStubSize();
1305 uint32_t *Placeholder =
1306 reinterpret_cast<uint32_t*>(computePlaceholderAddress(SectionID, Offset));
1307 if (RelType == ELF::R_ARM_PREL31 || RelType == ELF::R_ARM_TARGET1 ||
1308 RelType == ELF::R_ARM_ABS32) {
1309 Value.Addend += *Placeholder;
1310 } else if (RelType == ELF::R_ARM_MOVW_ABS_NC || RelType == ELF::R_ARM_MOVT_ABS) {
1311 // See ELF for ARM documentation
1312 Value.Addend += (int16_t)((*Placeholder & 0xFFF) | (((*Placeholder >> 16) & 0xF) << 12));
1314 processSimpleRelocation(SectionID, Offset, RelType, Value);
1316 } else if (IsMipsO32ABI) {
1317 uint8_t *Placeholder = reinterpret_cast<uint8_t *>(
1318 computePlaceholderAddress(SectionID, Offset));
1319 uint32_t Opcode = readBytesUnaligned(Placeholder, 4);
1320 if (RelType == ELF::R_MIPS_26) {
1321 // This is an Mips branch relocation, need to use a stub function.
1322 DEBUG(dbgs() << "\t\tThis is a Mips branch relocation.");
1323 SectionEntry &Section = Sections[SectionID];
1325 // Extract the addend from the instruction.
1326 // We shift up by two since the Value will be down shifted again
1327 // when applying the relocation.
1328 uint32_t Addend = (Opcode & 0x03ffffff) << 2;
1330 Value.Addend += Addend;
1332 // Look up for existing stub.
1333 StubMap::const_iterator i = Stubs.find(Value);
1334 if (i != Stubs.end()) {
1335 RelocationEntry RE(SectionID, Offset, RelType, i->second);
1336 addRelocationForSection(RE, SectionID);
1337 DEBUG(dbgs() << " Stub function found\n");
1339 // Create a new stub function.
1340 DEBUG(dbgs() << " Create a new stub function\n");
1341 Stubs[Value] = Section.StubOffset;
1342 uint8_t *StubTargetAddr =
1343 createStubFunction(Section.Address + Section.StubOffset);
1345 // Creating Hi and Lo relocations for the filled stub instructions.
1346 RelocationEntry REHi(SectionID, StubTargetAddr - Section.Address,
1347 ELF::R_MIPS_HI16, Value.Addend);
1348 RelocationEntry RELo(SectionID, StubTargetAddr - Section.Address + 4,
1349 ELF::R_MIPS_LO16, Value.Addend);
1351 if (Value.SymbolName) {
1352 addRelocationForSymbol(REHi, Value.SymbolName);
1353 addRelocationForSymbol(RELo, Value.SymbolName);
1356 addRelocationForSection(REHi, Value.SectionID);
1357 addRelocationForSection(RELo, Value.SectionID);
1360 RelocationEntry RE(SectionID, Offset, RelType, Section.StubOffset);
1361 addRelocationForSection(RE, SectionID);
1362 Section.StubOffset += getMaxStubSize();
1364 } else if (RelType == ELF::R_MIPS_HI16 || RelType == ELF::R_MIPS_PCHI16) {
1365 int64_t Addend = (Opcode & 0x0000ffff) << 16;
1366 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1367 PendingRelocs.push_back(std::make_pair(Value, RE));
1368 } else if (RelType == ELF::R_MIPS_LO16 || RelType == ELF::R_MIPS_PCLO16) {
1369 int64_t Addend = Value.Addend + SignExtend32<16>(Opcode & 0x0000ffff);
1370 for (auto I = PendingRelocs.begin(); I != PendingRelocs.end();) {
1371 const RelocationValueRef &MatchingValue = I->first;
1372 RelocationEntry &Reloc = I->second;
1373 if (MatchingValue == Value &&
1374 RelType == getMatchingLoRelocation(Reloc.RelType) &&
1375 SectionID == Reloc.SectionID) {
1376 Reloc.Addend += Addend;
1377 if (Value.SymbolName)
1378 addRelocationForSymbol(Reloc, Value.SymbolName);
1380 addRelocationForSection(Reloc, Value.SectionID);
1381 I = PendingRelocs.erase(I);
1385 RelocationEntry RE(SectionID, Offset, RelType, Addend);
1386 if (Value.SymbolName)
1387 addRelocationForSymbol(RE, Value.SymbolName);
1389 addRelocationForSection(RE, Value.SectionID);
1391 if (RelType == ELF::R_MIPS_32)
1392 Value.Addend += Opcode;
1393 else if (RelType == ELF::R_MIPS_PC16)
1394 Value.Addend += SignExtend32<18>((Opcode & 0x0000ffff) << 2);
1395 else if (RelType == ELF::R_MIPS_PC19_S2)
1396 Value.Addend += SignExtend32<21>((Opcode & 0x0007ffff) << 2);
1397 else if (RelType == ELF::R_MIPS_PC21_S2)
1398 Value.Addend += SignExtend32<23>((Opcode & 0x001fffff) << 2);
1399 else if (RelType == ELF::R_MIPS_PC26_S2)
1400 Value.Addend += SignExtend32<28>((Opcode & 0x03ffffff) << 2);
1401 processSimpleRelocation(SectionID, Offset, RelType, Value);
1403 } else if (IsMipsN64ABI) {
1404 uint32_t r_type = RelType & 0xff;
1405 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1406 if (r_type == ELF::R_MIPS_CALL16 || r_type == ELF::R_MIPS_GOT_PAGE
1407 || r_type == ELF::R_MIPS_GOT_DISP) {
1408 StringMap<uint64_t>::iterator i = GOTSymbolOffsets.find(TargetName);
1409 if (i != GOTSymbolOffsets.end())
1410 RE.SymOffset = i->second;
1412 RE.SymOffset = allocateGOTEntries(SectionID, 1);
1413 GOTSymbolOffsets[TargetName] = RE.SymOffset;
1416 if (Value.SymbolName)
1417 addRelocationForSymbol(RE, Value.SymbolName);
1419 addRelocationForSection(RE, Value.SectionID);
1420 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
1421 if (RelType == ELF::R_PPC64_REL24) {
1422 // Determine ABI variant in use for this object.
1423 unsigned AbiVariant;
1424 Obj.getPlatformFlags(AbiVariant);
1425 AbiVariant &= ELF::EF_PPC64_ABI;
1426 // A PPC branch relocation will need a stub function if the target is
1427 // an external symbol (Symbol::ST_Unknown) or if the target address
1428 // is not within the signed 24-bits branch address.
1429 SectionEntry &Section = Sections[SectionID];
1430 uint8_t *Target = Section.Address + Offset;
1431 bool RangeOverflow = false;
1432 if (SymType != SymbolRef::ST_Unknown) {
1433 if (AbiVariant != 2) {
1434 // In the ELFv1 ABI, a function call may point to the .opd entry,
1435 // so the final symbol value is calculated based on the relocation
1436 // values in the .opd section.
1437 findOPDEntrySection(Obj, ObjSectionToID, Value);
1439 // In the ELFv2 ABI, a function symbol may provide a local entry
1440 // point, which must be used for direct calls.
1441 uint8_t SymOther = Symbol->getOther();
1442 Value.Addend += ELF::decodePPC64LocalEntryOffset(SymOther);
1444 uint8_t *RelocTarget = Sections[Value.SectionID].Address + Value.Addend;
1445 int32_t delta = static_cast<int32_t>(Target - RelocTarget);
1446 // If it is within 26-bits branch range, just set the branch target
1447 if (SignExtend32<26>(delta) == delta) {
1448 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1449 if (Value.SymbolName)
1450 addRelocationForSymbol(RE, Value.SymbolName);
1452 addRelocationForSection(RE, Value.SectionID);
1454 RangeOverflow = true;
1457 if (SymType == SymbolRef::ST_Unknown || RangeOverflow) {
1458 // It is an external symbol (SymbolRef::ST_Unknown) or within a range
1459 // larger than 24-bits.
1460 StubMap::const_iterator i = Stubs.find(Value);
1461 if (i != Stubs.end()) {
1462 // Symbol function stub already created, just relocate to it
1463 resolveRelocation(Section, Offset,
1464 (uint64_t)Section.Address + i->second, RelType, 0);
1465 DEBUG(dbgs() << " Stub function found\n");
1467 // Create a new stub function.
1468 DEBUG(dbgs() << " Create a new stub function\n");
1469 Stubs[Value] = Section.StubOffset;
1470 uint8_t *StubTargetAddr =
1471 createStubFunction(Section.Address + Section.StubOffset,
1473 RelocationEntry RE(SectionID, StubTargetAddr - Section.Address,
1474 ELF::R_PPC64_ADDR64, Value.Addend);
1476 // Generates the 64-bits address loads as exemplified in section
1477 // 4.5.1 in PPC64 ELF ABI. Note that the relocations need to
1478 // apply to the low part of the instructions, so we have to update
1479 // the offset according to the target endianness.
1480 uint64_t StubRelocOffset = StubTargetAddr - Section.Address;
1481 if (!IsTargetLittleEndian)
1482 StubRelocOffset += 2;
1484 RelocationEntry REhst(SectionID, StubRelocOffset + 0,
1485 ELF::R_PPC64_ADDR16_HIGHEST, Value.Addend);
1486 RelocationEntry REhr(SectionID, StubRelocOffset + 4,
1487 ELF::R_PPC64_ADDR16_HIGHER, Value.Addend);
1488 RelocationEntry REh(SectionID, StubRelocOffset + 12,
1489 ELF::R_PPC64_ADDR16_HI, Value.Addend);
1490 RelocationEntry REl(SectionID, StubRelocOffset + 16,
1491 ELF::R_PPC64_ADDR16_LO, Value.Addend);
1493 if (Value.SymbolName) {
1494 addRelocationForSymbol(REhst, Value.SymbolName);
1495 addRelocationForSymbol(REhr, Value.SymbolName);
1496 addRelocationForSymbol(REh, Value.SymbolName);
1497 addRelocationForSymbol(REl, Value.SymbolName);
1499 addRelocationForSection(REhst, Value.SectionID);
1500 addRelocationForSection(REhr, Value.SectionID);
1501 addRelocationForSection(REh, Value.SectionID);
1502 addRelocationForSection(REl, Value.SectionID);
1505 resolveRelocation(Section, Offset,
1506 (uint64_t)Section.Address + Section.StubOffset,
1508 Section.StubOffset += getMaxStubSize();
1510 if (SymType == SymbolRef::ST_Unknown) {
1511 // Restore the TOC for external calls
1512 if (AbiVariant == 2)
1513 writeInt32BE(Target + 4, 0xE8410018); // ld r2,28(r1)
1515 writeInt32BE(Target + 4, 0xE8410028); // ld r2,40(r1)
1518 } else if (RelType == ELF::R_PPC64_TOC16 ||
1519 RelType == ELF::R_PPC64_TOC16_DS ||
1520 RelType == ELF::R_PPC64_TOC16_LO ||
1521 RelType == ELF::R_PPC64_TOC16_LO_DS ||
1522 RelType == ELF::R_PPC64_TOC16_HI ||
1523 RelType == ELF::R_PPC64_TOC16_HA) {
1524 // These relocations are supposed to subtract the TOC address from
1525 // the final value. This does not fit cleanly into the RuntimeDyld
1526 // scheme, since there may be *two* sections involved in determining
1527 // the relocation value (the section of the symbol referred to by the
1528 // relocation, and the TOC section associated with the current module).
1530 // Fortunately, these relocations are currently only ever generated
1531 // referring to symbols that themselves reside in the TOC, which means
1532 // that the two sections are actually the same. Thus they cancel out
1533 // and we can immediately resolve the relocation right now.
1535 case ELF::R_PPC64_TOC16: RelType = ELF::R_PPC64_ADDR16; break;
1536 case ELF::R_PPC64_TOC16_DS: RelType = ELF::R_PPC64_ADDR16_DS; break;
1537 case ELF::R_PPC64_TOC16_LO: RelType = ELF::R_PPC64_ADDR16_LO; break;
1538 case ELF::R_PPC64_TOC16_LO_DS: RelType = ELF::R_PPC64_ADDR16_LO_DS; break;
1539 case ELF::R_PPC64_TOC16_HI: RelType = ELF::R_PPC64_ADDR16_HI; break;
1540 case ELF::R_PPC64_TOC16_HA: RelType = ELF::R_PPC64_ADDR16_HA; break;
1541 default: llvm_unreachable("Wrong relocation type.");
1544 RelocationValueRef TOCValue;
1545 findPPC64TOCSection(Obj, ObjSectionToID, TOCValue);
1546 if (Value.SymbolName || Value.SectionID != TOCValue.SectionID)
1547 llvm_unreachable("Unsupported TOC relocation.");
1548 Value.Addend -= TOCValue.Addend;
1549 resolveRelocation(Sections[SectionID], Offset, Value.Addend, RelType, 0);
1551 // There are two ways to refer to the TOC address directly: either
1552 // via a ELF::R_PPC64_TOC relocation (where both symbol and addend are
1553 // ignored), or via any relocation that refers to the magic ".TOC."
1554 // symbols (in which case the addend is respected).
1555 if (RelType == ELF::R_PPC64_TOC) {
1556 RelType = ELF::R_PPC64_ADDR64;
1557 findPPC64TOCSection(Obj, ObjSectionToID, Value);
1558 } else if (TargetName == ".TOC.") {
1559 findPPC64TOCSection(Obj, ObjSectionToID, Value);
1560 Value.Addend += Addend;
1563 RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
1565 if (Value.SymbolName)
1566 addRelocationForSymbol(RE, Value.SymbolName);
1568 addRelocationForSection(RE, Value.SectionID);
1570 } else if (Arch == Triple::systemz &&
1571 (RelType == ELF::R_390_PLT32DBL || RelType == ELF::R_390_GOTENT)) {
1572 // Create function stubs for both PLT and GOT references, regardless of
1573 // whether the GOT reference is to data or code. The stub contains the
1574 // full address of the symbol, as needed by GOT references, and the
1575 // executable part only adds an overhead of 8 bytes.
1577 // We could try to conserve space by allocating the code and data
1578 // parts of the stub separately. However, as things stand, we allocate
1579 // a stub for every relocation, so using a GOT in JIT code should be
1580 // no less space efficient than using an explicit constant pool.
1581 DEBUG(dbgs() << "\t\tThis is a SystemZ indirect relocation.");
1582 SectionEntry &Section = Sections[SectionID];
1584 // Look for an existing stub.
1585 StubMap::const_iterator i = Stubs.find(Value);
1586 uintptr_t StubAddress;
1587 if (i != Stubs.end()) {
1588 StubAddress = uintptr_t(Section.Address) + i->second;
1589 DEBUG(dbgs() << " Stub function found\n");
1591 // Create a new stub function.
1592 DEBUG(dbgs() << " Create a new stub function\n");
1594 uintptr_t BaseAddress = uintptr_t(Section.Address);
1595 uintptr_t StubAlignment = getStubAlignment();
1596 StubAddress = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
1598 unsigned StubOffset = StubAddress - BaseAddress;
1600 Stubs[Value] = StubOffset;
1601 createStubFunction((uint8_t *)StubAddress);
1602 RelocationEntry RE(SectionID, StubOffset + 8, ELF::R_390_64,
1604 if (Value.SymbolName)
1605 addRelocationForSymbol(RE, Value.SymbolName);
1607 addRelocationForSection(RE, Value.SectionID);
1608 Section.StubOffset = StubOffset + getMaxStubSize();
1611 if (RelType == ELF::R_390_GOTENT)
1612 resolveRelocation(Section, Offset, StubAddress + 8, ELF::R_390_PC32DBL,
1615 resolveRelocation(Section, Offset, StubAddress, RelType, Addend);
1616 } else if (Arch == Triple::x86_64) {
1617 if (RelType == ELF::R_X86_64_PLT32) {
1618 // The way the PLT relocations normally work is that the linker allocates
1620 // PLT and this relocation makes a PC-relative call into the PLT. The PLT
1621 // entry will then jump to an address provided by the GOT. On first call,
1623 // GOT address will point back into PLT code that resolves the symbol. After
1624 // the first call, the GOT entry points to the actual function.
1626 // For local functions we're ignoring all of that here and just replacing
1627 // the PLT32 relocation type with PC32, which will translate the relocation
1628 // into a PC-relative call directly to the function. For external symbols we
1629 // can't be sure the function will be within 2^32 bytes of the call site, so
1630 // we need to create a stub, which calls into the GOT. This case is
1631 // equivalent to the usual PLT implementation except that we use the stub
1632 // mechanism in RuntimeDyld (which puts stubs at the end of the section)
1633 // rather than allocating a PLT section.
1634 if (Value.SymbolName) {
1635 // This is a call to an external function.
1636 // Look for an existing stub.
1637 SectionEntry &Section = Sections[SectionID];
1638 StubMap::const_iterator i = Stubs.find(Value);
1639 uintptr_t StubAddress;
1640 if (i != Stubs.end()) {
1641 StubAddress = uintptr_t(Section.Address) + i->second;
1642 DEBUG(dbgs() << " Stub function found\n");
1644 // Create a new stub function (equivalent to a PLT entry).
1645 DEBUG(dbgs() << " Create a new stub function\n");
1647 uintptr_t BaseAddress = uintptr_t(Section.Address);
1648 uintptr_t StubAlignment = getStubAlignment();
1649 StubAddress = (BaseAddress + Section.StubOffset + StubAlignment - 1) &
1651 unsigned StubOffset = StubAddress - BaseAddress;
1652 Stubs[Value] = StubOffset;
1653 createStubFunction((uint8_t *)StubAddress);
1655 // Bump our stub offset counter
1656 Section.StubOffset = StubOffset + getMaxStubSize();
1658 // Allocate a GOT Entry
1659 uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
1661 // The load of the GOT address has an addend of -4
1662 resolveGOTOffsetRelocation(SectionID, StubOffset + 2, GOTOffset - 4);
1664 // Fill in the value of the symbol we're targeting into the GOT
1665 addRelocationForSymbol(
1666 computeGOTOffsetRE(SectionID, GOTOffset, 0, ELF::R_X86_64_64),
1670 // Make the target call a call into the stub table.
1671 resolveRelocation(Section, Offset, StubAddress, ELF::R_X86_64_PC32,
1674 RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend,
1676 addRelocationForSection(RE, Value.SectionID);
1678 } else if (RelType == ELF::R_X86_64_GOTPCREL) {
1679 uint64_t GOTOffset = allocateGOTEntries(SectionID, 1);
1680 resolveGOTOffsetRelocation(SectionID, Offset, GOTOffset + Addend);
1682 // Fill in the value of the symbol we're targeting into the GOT
1683 RelocationEntry RE = computeGOTOffsetRE(SectionID, GOTOffset, Value.Offset, ELF::R_X86_64_64);
1684 if (Value.SymbolName)
1685 addRelocationForSymbol(RE, Value.SymbolName);
1687 addRelocationForSection(RE, Value.SectionID);
1688 } else if (RelType == ELF::R_X86_64_PC32) {
1689 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1690 processSimpleRelocation(SectionID, Offset, RelType, Value);
1691 } else if (RelType == ELF::R_X86_64_PC64) {
1692 Value.Addend += support::ulittle64_t::ref(computePlaceholderAddress(SectionID, Offset));
1693 processSimpleRelocation(SectionID, Offset, RelType, Value);
1695 processSimpleRelocation(SectionID, Offset, RelType, Value);
1698 if (Arch == Triple::x86) {
1699 Value.Addend += support::ulittle32_t::ref(computePlaceholderAddress(SectionID, Offset));
1701 processSimpleRelocation(SectionID, Offset, RelType, Value);
1706 size_t RuntimeDyldELF::getGOTEntrySize() {
1707 // We don't use the GOT in all of these cases, but it's essentially free
1708 // to put them all here.
1711 case Triple::x86_64:
1712 case Triple::aarch64:
1713 case Triple::aarch64_be:
1715 case Triple::ppc64le:
1716 case Triple::systemz:
1717 Result = sizeof(uint64_t);
1722 Result = sizeof(uint32_t);
1725 case Triple::mipsel:
1726 case Triple::mips64:
1727 case Triple::mips64el:
1729 Result = sizeof(uint32_t);
1730 else if (IsMipsN64ABI)
1731 Result = sizeof(uint64_t);
1733 llvm_unreachable("Mips ABI not handled");
1736 llvm_unreachable("Unsupported CPU type!");
1741 uint64_t RuntimeDyldELF::allocateGOTEntries(unsigned SectionID, unsigned no)
1743 (void)SectionID; // The GOT Section is the same for all section in the object file
1744 if (GOTSectionID == 0) {
1745 GOTSectionID = Sections.size();
1746 // Reserve a section id. We'll allocate the section later
1747 // once we know the total size
1748 Sections.push_back(SectionEntry(".got", nullptr, 0, 0));
1750 uint64_t StartOffset = CurrentGOTIndex * getGOTEntrySize();
1751 CurrentGOTIndex += no;
1755 void RuntimeDyldELF::resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset, uint64_t GOTOffset)
1757 // Fill in the relative address of the GOT Entry into the stub
1758 RelocationEntry GOTRE(SectionID, Offset, ELF::R_X86_64_PC32, GOTOffset);
1759 addRelocationForSection(GOTRE, GOTSectionID);
1762 RelocationEntry RuntimeDyldELF::computeGOTOffsetRE(unsigned SectionID, uint64_t GOTOffset, uint64_t SymbolOffset,
1765 (void)SectionID; // The GOT Section is the same for all section in the object file
1766 return RelocationEntry(GOTSectionID, GOTOffset, Type, SymbolOffset);
1769 void RuntimeDyldELF::finalizeLoad(const ObjectFile &Obj,
1770 ObjSectionToIDMap &SectionMap) {
1772 if (!PendingRelocs.empty())
1773 report_fatal_error("Can't find matching LO16 reloc");
1775 // If necessary, allocate the global offset table
1776 if (GOTSectionID != 0) {
1777 // Allocate memory for the section
1778 size_t TotalSize = CurrentGOTIndex * getGOTEntrySize();
1779 uint8_t *Addr = MemMgr.allocateDataSection(TotalSize, getGOTEntrySize(),
1780 GOTSectionID, ".got", false);
1782 report_fatal_error("Unable to allocate memory for GOT!");
1784 Sections[GOTSectionID] = SectionEntry(".got", Addr, TotalSize, 0);
1787 Checker->registerSection(Obj.getFileName(), GOTSectionID);
1789 // For now, initialize all GOT entries to zero. We'll fill them in as
1790 // needed when GOT-based relocations are applied.
1791 memset(Addr, 0, TotalSize);
1793 // To correctly resolve Mips GOT relocations, we need a mapping from
1794 // object's sections to GOTs.
1795 for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
1797 if (SI->relocation_begin() != SI->relocation_end()) {
1798 section_iterator RelocatedSection = SI->getRelocatedSection();
1799 ObjSectionToIDMap::iterator i = SectionMap.find(*RelocatedSection);
1800 assert (i != SectionMap.end());
1801 SectionToGOTMap[i->second] = GOTSectionID;
1804 GOTSymbolOffsets.clear();
1808 // Look for and record the EH frame section.
1809 ObjSectionToIDMap::iterator i, e;
1810 for (i = SectionMap.begin(), e = SectionMap.end(); i != e; ++i) {
1811 const SectionRef &Section = i->first;
1813 Section.getName(Name);
1814 if (Name == ".eh_frame") {
1815 UnregisteredEHFrameSections.push_back(i->second);
1821 CurrentGOTIndex = 0;
1824 bool RuntimeDyldELF::isCompatibleFile(const object::ObjectFile &Obj) const {